Thermo CFT-150 Instruction And Operation Manual Download

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NESLAB CFT Series

Recirculating Chiller

Thermo Manual P/N U00362

Rev. 08/18/99

Instruction and Operation Manual

No part of this publication may be repro-

duced or reprinted except for personal use

without the prior permission of Thermo

Electron.

Summary of Contents for CFT-150

Page 1: ...circulating Chiller Thermo Manual P N U00362 Rev 08 18 99 Instruction and Operation Manual No part of this publication may be repro duced or reprinted except for personal use without the prior permission of Thermo Electron ...

Page 2: ...ns 12 FillingRequirements 13 SECTION IV Operation Start Up 15 Temperature Controller 16 Temperature Limits 17 Pressure Relief Valve 17 High Low Pressure Cutouts 17 High Temperature Cutout Optional 18 Heater Package Optional 18 External Pressure Reducer Optional 19 SECTION V Maintenance Service Service Contracts 20 Draining the Reservoir 20 Cleaning 20 Algae 21 Pump Strainer 21 Pump Lubrication 22 ...

Page 3: ...ir cooled refrigeration system Air is drawn in the front of the unit and discharged through rear and side Position the unit so the intake and discharge are not impeded Inadequate ventilation will cause a reduction in cooling capac ity and in extreme cases compressor failure Excessively dusty areas should be avoided and a periodic cleaning schedule should be instituted For proper operation the unit...

Page 4: ...modified to operate at 0 C or lower it has been tested with a non freezing fluid Although the system has been drained some residual fluid may remain This will not hinder your unit s performance Warranty Units have a warranty against defective parts and workmanship for one full year from date of shipment See back page for more details NES care Extended Warranty Contract Extend parts and labor cover...

Page 5: ...orrosive materials are present The unit construction provides protection against the risk of electrical shock by grounding appropriate metal parts The protection may not function unless the power cord is connected to a properly grounded outlet It is the user s responsibility to assure a proper ground connec tion is provided Never connect the OUTLET SUPPLY or INLET RETURN fitting to your building w...

Page 6: ...t with care Sudden jolts or drops can damage the refrigeration lines Observe all warning labels Never remove warning labels Never operate damaged or leaking equipment Never operate the unit without cooling fluid in the reservoir Always turn off the unit and disconnect the power cord from the power source before performing any service or maintenance procedures or before moving the unit Always empty...

Page 7: ... capacity will vary depending on fluid temperature ambient temperature and cooling fluid A PD 1 pump was used in the CFT 25 a PD 2 in the other units 3 Modified temperature ranges from 15 C to 85 C are available 4 CFT 300 stability determined with 86 heat load 5 1 25 gallons 4 73 liters for 50 Hertz CFT 75 units 1 8 6 8 CFT 25 CFT 33 CFT 75 CFT 150 CFT 300 1 0 C 1 1 4 2 5 6 21 3 R22 R134a 5 C to 3...

Page 8: ...eft side to the center of the INLET and OUTLET connections 7 Dimension I is the distance from the unit s left side to the center of the DRAIN connection CFT 150 300 only 8 Weights are given in pounds 9 Air intake is given in cubic feet per minute Unit Dimensions Dimension A Dimension B Dimension C Dimension D Dimension E Dimension F Dimension G Dimension H Dimension I Crate Dimensions H x W x D Sh...

Page 9: ...SI 1 2 3 4 GPM 3 8 7 5 11 3 15 1 LPM Flow Pump Capacity 1 2 3 4 5 GPM 3 8 7 5 11 3 15 1 19 0 LPM A PD 1 60Hz B PD 1 50Hz C PD 2 60Hz D PD 2 50Hz A C D A MD 30 60Hz B MD 30 50Hz A CP 55 60Hz B CP 55 50Hz 3 4 2 7 2 0 1 3 0 7 B Pressure 50 40 30 20 10 Bar PSI A Flow 5 10 15 20 25 30 GPM 18 9 37 9 56 8 75 5 94 6 113 6 LPM ...

Page 10: ...nels The unit must be positioned so the intake and discharge are not impeded A minimum clearance of 18 inches 45 centimeters on all vented sides is necessary for adequate ventilation Inadequate ventilation will cause a reduction in cooling capacity and in extreme cases compressor failure Excessively dusty areas should be avoided and a periodic cleaning schedule should be instituted see Section V C...

Page 11: ...the oil in the compressor and prevents refrigerant from mixing with the oil Before start up the unit must be connected to its power source for at least 12 hours This allows time for the oil to be heated and separatefromtherefrigerant Plumbing Requirements Before installing the unit to an instrument that previously used tap water as a cooling fluid flush the instrument several times to remove any r...

Page 12: ...illed with cooling fluid before connecting them to the unit Fluids Never use flammable or corrosive fluids with this unit Do not use automotive anti freeze Commercial anti freeze contains silicates that can damage the pump seals Use of automotive anti freeze will void the manufacturer s warranty We recommends using distilled deionized water with a 0 05 to 0 1 megohm cm reading Highly distilled dei...

Page 13: ...at the coil will leak refrigerant into the waterreservoir As an example raw water in the United States averages171ppm ofNaCl Therecommended level for use in a water system is between 0 5 to 5 0 ppm ofNaCl Recommendation Initially fill the tank with distilled deionized water Do not use untreated tap water as the total ionized solids level may be too high Maintain this water quality at a resistivity...

Page 14: ...ssure built up from thermal expansion of water The vent is located on the reservoir plug It activates when tank pressure reaches 3 5 psi Do not replace reservoir plug with a non vented type or damage to the tank may occur Circulating to an open system open to the atmosphere Fill the reservoir so of the fill hole threads are covered Wrap the tank plug with Teflon sealing tape Replace the tank plug ...

Page 15: ... 14 Blank page ...

Page 16: ...ing pressure on the RECIR CULATING PRESSURE gauge To turn the unit off place the POWER Switch to the off 0 position COOL indicates the status of the refrigeration system It illuminates to indi cate the refrigeration system is removing heat from the cooling fluid As the operating temperature approaches the temperature setpoint the LED will flash IDLE indicates the unit is in a hot gas bypass mode o...

Page 17: ...nge the setpoint The display flashes as soon as either key is depressed Once the desired setpoint is displayed press NEXT ENTER NOTE The controller does not use the new value until the NEXT ENTER key is depressed and the display stops flashing The controller will not allow you to enter a value above the maximum or below the minimum value or any illegal value If you try to enter an illegal value th...

Page 18: ...a pressure relief valve that establishes the maximum operat ing pressure of the unit If the pressure of the fluid leaving the pump exceeds the valve setting the relief valve bypasses the fluid within the unit to relieve the pressure The relief valve does not determine the actual operating pres sure the system back pressure determines operating pressure If an adjustment is necessary contact our Cus...

Page 19: ...the unit The controller will indicate a low level display if the fluid level in the reservoir drops below proper operating level Illustration A shows the desired fluid level for normal operation Should the reservoir be filled as shown in illustration B units designed to operate at high end temperatures near boiling may cause air in the reservoir to become trapped The air can be vented by slightly ...

Page 20: ...cation to the remain ing fitting of the Outlet Tee Assembly 2 Connect the outlet from your application to the remaining fitting of the Inlet Tee Assembly 1 Tighten the hose clamps tight enough to prevent leakage Do not overtighten or the clamps will bite into the flexible tubing and cause excessive wear If a torque wrench is available torque hose clamps to 50 in lbs 280 cm kg Nylon reinforced hose...

Page 21: ...inside the reservoir If cleaning is necessary flush the reservoir with a cleaning fluid compatible with the circulating system and the cooling fluid The cooling fluid should be replaced periodically When operating at low temperatures the concentration of water in the cooling fluid will increase over time leading to a loss of cooling capacity Before changing the cooling fluid raise the operating te...

Page 22: ... installation the strainer may become clogged with debris and scale Therefore the strainer must be cleaned after the first week of installa tion After this first cleaning we recommend a monthly visual inspection After several months the cleaning frequency will be established Before cleaning the strainer disconnect the power cord from the power source and drain the reservoir PD 1 pumps have a wire ...

Page 23: ... 185 4 6 CFT 150 PD2 R22 70 270 2 8 CFT 300 PD2 R22 88 94 265 280 6 8 CFT 300 CP 55 R22 85 90 268 280 6 8 Standard temperature 60 Hertz units derate 17 for 50 Hertz Units 20 C fluid temperature unit in the COOL mode 20 C ambient 100 water in the reservoir Wrapper removed Pump Motor Lubrication Some PD pump motors require periodic lubrication Refer to the pump label on the rear of the unit to ident...

Page 24: ...y set default values Displaying Software Version This procedure will display the software version number on the unit s display In the event the unit is not operational the software version and the checksum can also be read from the label which is on the microprocessor chip itself The following chart uses an example of software version 000507 49b begin at the reservoir temperature display 2 0 3 C P...

Page 25: ... event of an open fuse investigate and correct the source of the overload before replacing the fuse s Always turn off the unit and disconnect the line cord from the power source before attempting to do any service To replace the fuses remove the two screws from the main control panel and then open the panel door For units equipped with a 380V 3 Phase CP 55 pump our part number 008596 replace the f...

Page 26: ...nstrument being cooled for restrictions in the cooling line Check the pump strainer units with PD pumps A clogged strainer can starve the pump Inadequate temperature control If the temperature continues to rise make sure the heat load of the instrument being cooled does not exceed the rated specification see Section II Specifications Make sure the air intake and discharge are not impeded and the a...

Page 27: ...proper installation or maintenance or to any unit that has been operated or maintained in any way contrary to the operating or maintenance instructions specified in Thermo s Instruction and Operation Manual This warranty does not cover any unit that has been altered or modified so as to change its intended use In addition this warranty does not extend to repairs made by the use of parts accessorie...

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